Hi, If you would index additional grid ids for the bins, you could facet on them. To me, Elasticsearch's Aggregation Module may also be a good fit.
Uwe Am 6. November 2014 04:52:10 MEZ, schrieb Shahak Nagiel <snag...@yahoo.com.INVALID>: >I need a way to perform a spatial aggregation query against a >potentially large document store in order to display summary clusters >on a map. The query would slice the current map extents (e.g. >-180,-90,180,90) into a number of X and Y bins (e.g. 20 x 16) and, for >each, seek a summary count, so that a heat map or series of clusters >could be rendered for the grids. > >Given Lucene's native usage of prefix trees/geohashes, this seems to be >a good fit. As a user pans and zooms the map, new map extents would >apply, so this would need to support dynamic grids. However, snapping >results/bins to existing geohashes (of the appropriate depth/level) >would be fine, assuming that lines up with how the indexes are >structured. > >Naively, I could just issue a series of spatial queries, one for each >grid, and get the count. But I wonder if there's a better way... > >Has anyone encountered this use case? Any suggestions on the best/most >efficient way to achieve? > >Thanks! -- Uwe Schindler H.-H.-Meier-Allee 63, 28213 Bremen http://www.thetaphi.de
